Buggy code:
private StopTest ( boolean b ) { } public void run ( ) { if ( running ) { running = false ; if ( now ) { tellThreadsToStop ( ) ; } else { stopAllThreads ( ) ; } try { Thread . sleep ( ( 10 * ( allThreads . size ( ) ) ) ) ; } catch ( InterruptedException e ) { } boolean stopped = verifyThreadsStopped ( ) ; if ( stopped || ( now ) ) { notifyTestListenersOfEnd ( testListenersSave ) ; } } } } public void run ( ) { StandardJMeterEngine . log . info ( "Running<seq2seq4repair_space>the<seq2seq4repair_space>test!" ) ; running = true ; SearchByClass testPlan = new SearchByClass ( TestPlan . class ) ; test . traverse ( testPlan ) ; Object [ ] plan = testPlan . getSearchResults ( ) . toArray ( ) ; if ( ( plan . length ) == 0 ) { System . err . println ( "Could<seq2seq4repair_space>not<seq2seq4repair_space>find<seq2seq4repair_space>the<seq2seq4repair_space>TestPlan!" ) ; StandardJMeterEngine . log . error ( "Could<seq2seq4repair_space>not<seq2seq4repair_space>find<seq2seq4repair_space>the<seq2seq4repair_space>TestPlan!" ) ; System . exit ( 1 ) ; } if ( ( ( TestPlan ) ( plan [ 0 ] ) ) . isSerialized ( ) ) { serialized = true ; } JMeterContextService . startTest ( ) ; try { PreCompiler compiler = new PreCompiler ( ) ; test . traverse ( compiler ) ; } catch ( RuntimeException e ) { StandardJMeterEngine . log . error ( "Error<seq2seq4repair_space>occurred<seq2seq4repair_space>compiling<seq2seq4repair_space>the<seq2seq4repair_space>tree:" , e ) ; JMeterUtils . reportErrorToUser ( "Error<seq2seq4repair_space>occurred<seq2seq4repair_space>compiling<seq2seq4repair_space>the<seq2seq4repair_space>tree:<seq2seq4repair_space>-<seq2seq4repair_space>see<seq2seq4repair_space>log<seq2seq4repair_space>file" ) ; return ; } SearchByClass testListeners = new SearchByClass ( TestListener . class ) ; test . traverse ( testListeners ) ; testListeners . getSearchResults ( ) . addAll ( StandardJMeterEngine . testList ) ; StandardJMeterEngine . testList . clear ( ) ; testListenersSave = testListeners ; if ( ! ( StandardJMeterEngine . startListenersLater ) ) { notifyTestListenersOfStart ( testListeners ) ; } test . traverse ( new TurnElementsOn ( ) ) ; if ( StandardJMeterEngine . startListenersLater ) { notifyTestListenersOfStart ( testListeners ) ; } List testLevelElements = new LinkedList ( test . list ( test . getArray ( ) [ 0 ] ) ) ; removeThreadGroups ( testLevelElements ) ; SearchByClass searcher = new SearchByClass ( ThreadGroup . class ) ; test . traverse ( searcher ) ; TestCompiler . initialize ( ) ; Iterator iter = searcher . getSearchResults ( ) . iterator ( ) ; System . gc ( ) ; ListenerNotifier notifier = new ListenerNotifier ( ) ; JMeterContextService . getContext ( ) . setSamplingStarted ( true ) ; int groupCount = 0 ; JMeterContextService . clearTotalThreads ( ) ; startingGroups = true ; while ( ( running ) && ( iter . hasNext ( ) ) ) { groupCount ++ ; ThreadGroup group = ( ( ThreadGroup ) ( iter . next ( ) ) ) ; int numThreads = group . getNumThreads ( ) ; JMeterContextService . addTotalThreads ( numThreads ) ; boolean onErrorStopTest = group . getOnErrorStopTest ( ) ; boolean onErrorStopThread = group . getOnErrorStopThread ( ) ; String groupName = group . getName ( ) ; int rampUp = group . getRampUp ( ) ; float perThreadDelay = ( ( float ) ( rampUp * 1000 ) ) // ( ( float ) ( numThreads ) ) ; StandardJMeterEngine . log . info ( ( ( ( ( ( ( "Starting<seq2seq4repair_space>" + numThreads ) + "<seq2seq4repair_space>threads<seq2seq4repair_space>for<seq2seq4repair_space>group<seq2seq4repair_space>" ) + groupName ) + ".<seq2seq4repair_space>Ramp<seq2seq4repair_space>up<seq2seq4repair_space>=<seq2seq4repair_space>" ) + rampUp ) + "." ) ) ; if ( onErrorStopTest ) { StandardJMeterEngine . log . info ( "Test<seq2seq4repair_space>will<seq2seq4repair_space>stop<seq2seq4repair_space>on<seq2seq4repair_space>error" ) ; } else if ( onErrorStopThread ) { StandardJMeterEngine . log . info ( "Thread<seq2seq4repair_space>will<seq2seq4repair_space>stop<seq2seq4repair_space>on<seq2seq4repair_space>error" ) ; } else { StandardJMeterEngine . log . info ( "Thread<seq2seq4repair_space>will<seq2seq4repair_space>continue<seq2seq4repair_space>on<seq2seq4repair_space>error" ) ; } ListedHashTree threadGroupTree = ( ( ListedHashTree ) ( searcher . getSubTree ( group ) ) ) ; threadGroupTree . add ( group , testLevelElements ) ; for ( int i = 0 ; ( running ) && ( i < numThreads ) ; i ++ ) { final JMeterThread jmeterThread = new JMeterThread ( cloneTree ( threadGroupTree ) , this , notifier ) ; jmeterThread . setThreadNum ( i ) ; jmeterThread . setThreadGroup ( group ) ; jmeterThread . setInitialContext ( JMeterContextService . getContext ( ) ) ; jmeterThread . setInitialDelay ( ( ( int ) ( perThreadDelay * i ) ) ) ; final String threadName = ( ( ( groupName + "<seq2seq4repair_space>" ) + groupCount ) + "-" ) + ( i + 1 ) ; jmeterThread . setThreadName ( threadName ) ; scheduleThread ( jmeterThread , group ) ; jmeterThread . setEngine ( this ) ; jmeterThread . setOnErrorStopTest ( onErrorStopTest ) ; jmeterThread . setOnErrorStopThread ( onErrorStopThread ) ; Thread newThread = new Thread ( jmeterThread ) ; newThread . setName ( threadName ) ; allThreads . put ( jmeterThread , newThread ) ; newThread . start ( ) ; } <START_BUG> if ( ( serialized ) && ( ! ( iter . hasNext ( ) ) ) ) { <END_BUG> StandardJMeterEngine . log . info ( ( ( "Waiting<seq2seq4repair_space>for<seq2seq4repair_space>thread<seq2seq4repair_space>group:<seq2seq4repair_space>" + groupName ) + "<seq2seq4repair_space>to<seq2seq4repair_space>finish<seq2seq4repair_space>before<seq2seq4repair_space>starting<seq2seq4repair_space>next<seq2seq4repair_space>group" ) ) ; while ( ( running ) && ( ( allThreads . size ( ) ) > 0 ) ) { try { Thread . sleep ( 1000 ) ; } catch ( InterruptedException e ) { } } } } if ( running ) { StandardJMeterEngine . log . info ( "All<seq2seq4repair_space>threads<seq2seq4repair_space>have<seq2seq4repair_space>been<seq2seq4repair_space>started" ) ; } else { StandardJMeterEngine . log . info ( "Test<seq2seq4repair_space>stopped<seq2seq4repair_space>-<seq2seq4repair_space>no<seq2seq4repair_space>more<seq2seq4repair_space>threads<seq2seq4repair_space>will<seq2seq4repair_space>be<seq2seq4repair_space>started" ) ; } startingGroups = false ; } private void scheduleThread ( JMeterThread thread , ThreadGroup group ) { } private boolean verifyThreadsStopped ( ) { } private void tellThreadsToStop ( ) { } public void askThreadsToStop ( ) { } public void askThreadsToStopNow ( ) { } private void stopAllThreads ( ) { } public void exit ( ) { } public void setProperties ( Properties p ) { } }

Fix:
if ( ( serialized ) && ( iter . hasNext ( ) ) ) {